Protective helmet



1. Protective helmet

1.1 : Perspective

1.2 : Front

1.3 : Back

1.4 : Left

1.5 : Right

1.6 : Top

1.7 : Bottom

The broken lines shown in the drawings represent portions of the protective helmet that form no parts of the claimed design. 

CLAIM The ornamental design for a protective helmet, as shown and described. 